Furnace.



WQ S. QUIGLEY.

PURNACB.

APPLIGATIGN FAILED JUNEa, 1912.

1,039,801. Patented o@t.'1,1912. l

UNITED i sTaTEs PATENT o'EEIcE.

WIRT S. QUIGL'EY, OFROCKAWAY PARK, N EW' YORK.

FURNACE.

Toall whom 'it may concern:

what are known as over-lired furnaces, vin' which the combustion chamber is located above the heating chamber so that the heat generated in the `combustion chamber will be discharged downwardly into the heating chamber. In furnaces of this character, 'especially for those `used forwork requiring accurate and controllable temperature, such as heating for hardening and tempering i purposes, it quite frequently becomes desirable tosuddenly check a rise or to lower the temperature of the furnace. Heretofore the only method of securing either of 'these results has Abeen to close off the burner or other heat producing arrangement and open the doors leading from the outer air to the 'heating chamber. 'But 'this method is not etlicient nor always permissible for the reason that the heat remaining stored up in the combustion chamber, which is necessarily heated to a degree higher than that of the heating chamber, is sutlicient to keep up or even increase the temperature of the heating chamber for a period of time after the burners are shut oil", and by opening the doors unequal and too sudden cooling is effected. Briefly stated, my invention aims to secure accurate control of the temperature of furnaces of this type and further to provide for the uniform lowering or checking of the temperature of such furnaces.

Specication of Letters Patent.

Application filed .Tune 8, 1 912. Serial No. 702,434.

My invention accordingly resides in .the-

combination with an over-tired furnace having a heating chamber and a combustion chamber above the heating chanber, in free cmninunicaliontherewith, of means for controlling the heat of such furnaces comprising` a 'regulating relief passage in the top 0f the combustion chamber which may bepartially or wholly opened, and which when so opened is arranged to permit the escape of the heat from the combustion chamber without passing into or through the heat-ing chamber, the relief passage -being independent of the means of escape normally alIord-- Patented Oct. 1, 1912.

ed by the exit ues, with which the heating chamber is provided.

Various other objects and features of the invention will appear as the reading of thc specication proceed-S;

,. The accompanyingdrawings typify the invention in the preferred form,' but I wish it to be understood that various changes and modifications may be made without departing from the true spirit and scope of t-h'e nivention. Y

In the drawings: Figure 1 is' a Avertical cross 'section of an annealingfurnaceem-V bodying the invention taken on line l-'l of .Fig 2, parts being broken away, and Fig.

2 is a broken plan view of a portion of the same. v 4

In the drawings like reference chaifacters are ,used to indicate like parts.

' The drawings illustrate an annealing furnace of the over-fired type in which the furnace body l is provided with a heating chamber 2 in the lower portionl thereof andl with a 'combustion chamber 11 directly above the heating chamber, the heat in this oase being supplied by one or more hydrocarbon'burners (a recess for one of 'which is shown at 4) discharging into the combus. tion chamber through burner openings (one of which is shown at 5) preferably disposed in the side of the combustion chamber, as shown. The two chambers are preferably separated'more or less by Aan `arched wall 6 but free communication is allowed for between the chambers'by providing this arch -with open-ings 7 therein. For the purpose of directing ttc` heat in, the combustion chamber down into the heating chamber the combustionchamber is preferably provldedV with an arched roof 8. Batlles 9, 9, may be provided for breaking up the blast from the burner and deflecting the products of combustion.

As pointed out in the introductory statement, it has only been possible to control the heat of furnaces of this type heretofore `by shutting off the burner or opening up the door or doors l0 at the end or ends of the heating chamber. It is obvious that regulation by opening door l() will make a sudden drop, especially near the doors, caused by the inrush of cold -air, and not gradually hold or reduce the temperature asusually desired, while if the burners are stopped without opening the door, the heat pent up within the combustion chamber will incomingv be ell'ectively radiated down into the heating chamber for-a considerable time even after the burners have been cut off. As, in the present day work, accurate heat treatment is absolutely necessary, such as for anv nealing, hardening and tempermg purposes,

and as it is frequently desirable to secure j the sudden but even stopping or lowering -in temperature of the furnace, I have pro! substantially at the top of the arch and vided for the accomplishment of this result by the placing of a-relief passage or opening 3 inthe roofof the combustion chamber therefore at Ythe highest point in said chamber. This relief passage is provided with a controllable gate or valve 12, the regulation the relief passage in the top o f the com-l bustion chamber will be closed and the hot gases will pass off by the usual iues`l4.

lAt any time that a suddencheckmg in temperature is desirable, the-slide valve 12 or other closure will be lshifted to openup the relief passage. The burners also'will usulally be shut off. When this is done, it will 'be clear that free escape will be provided fdr the heat within the combustion chamber, thereby spilling the heat, as it is termed, and bringing about a lowering of the temperature in the furnace, or at least preventing its further rise. It will be evident that not only does this spilling process permit the free escape of the heat in the combustion cha.n1ber,"but also of the heat in the heating chamber, .on account of the free communication allowed between the twoV chambers. Normallythe products of combastion escape from the furnace by way of one or more exit ffues 14 shown in dotted lines in Fig. l, extending from the heating chamber to the exterior of the furnace. `In the preferred arrangement these exit iues extend from the bottom portion of the heating chamber up through the side walls to the top of the furnace thusproviding circulation of the gases of combustion from :the combustion chamber, down into the heating chamber and up to and through the top of the furnace, and when the relief opening 01 openings (the number depending upon the size of the furnace) are open', the heat and products of combustionare no longer forced to traverse this usual path through lues 14,

14, but naturally seek the Shortest course and are allowed to escape direct out throughthe top of the combustion chamber by way of relief passage 3. In case a sharp drop of temperature should be required, the slide l2 may be with drawn to open passage 3, and the furnace door Vl0 may be simultaneously opened. This would produce an updraft ofl cold air through the furnace that would produceesudden chilling and would only be done in extreme cases.

AHaving described myiinventi'on, I claim:

1. A furnace comprising'a heating chamber, a combustion chamber above the heating chamber and `in free communication therewith, a burner discharging into the combustion chamber, an 'exit iueor flues extending from the heating chamber and forming a normal means of escape for prod- .ucts of combustion, and the combustion chamber having a relief opening and means for controllmg the same arranged y when open to form a means of escape Vof products of combustion direct from the combustion chamber independent of the exit flue or fines.

2. A furnace comprising a heating chamber, a 'combustion chamber above the heat/IV mg chamber and in free communication therewith, a burner discharging into the combustion chamber, exit flues extending from the heating chamber to the exterior of the furnace forming the normal means of escape from the furnace of products 'of combustion, the combustion chamberihavng a. relief opening in the top thereof arranged toform a means of escape for: products of combustiondirect from the combustion chamber-wholly apart and independent of the escape afforded by the exit dues, and an adjustable closure to the said relief opening.

3. A furnace comprising a heating chamber, a combustion chamber above the heat# ing chamber, a burner discharging into the combustion chamber, a Wall between the combustion chamber' and heating chamber provided with openings to permit the products of combustion from the burner to pass on down into the heating chamber, the com- 'bust-ion chamber being provided with arel'ief opening in the topl thereof arranged' when open to permit the heat in the combustion chamber to escape direct through the roof of such chamber, and an adjustable closure controlling the said relief opening.

4. Afurnace comprising a heating chamber, a combustion chamber above the heating chamber, a burner discharging in through the side of the combustion chamber, a wall between the combustion chamber and heating chamber provided with passes therein, to permit heat in the combustion chamber to pass on down into the heatingchamber, an arched roof to the combustion chamber provided with a relief opening therein substantially at the highest point of the arch arrangement when open to permit free' escape of the heat in the combustion chamber,

and'an adjustable closure tothe said reliefl opening.

Aber in free communication with the same, a

burner discharging inwardly through the side of the combustion chamber, the combustion chamber having an arched roof for directing the heat down into the heatingchamber, said roof having a relief opening therein substantially at-the top of the arch arranged to provide free escape for the heat in the combustion chamber When the same is open, and an adjustable closure for said relief opening.

6. A furnace comprising a furnace body provided with a heating chamber in the lower part thereof, and with a combustion chamber above the heating chamber, an arch separating the two chambers, provided with openings herein to permit free communication between the chambers, a burner discharging inwardly through the side of the combustion chamber, the combustion chamber having an arched roof to direct the products of combustion down into the heating chamber, the said roof being provided with a relief opening therein substantially at the top .of the arch arranged when open to permit free escape of the heat confined within the combustion chamber, and an adjustable closure for the relief o ening slidably mounted on the top of the urnace body.

WIRT S. QUIGLEY. W'itnesses:

A PARKERSMITH, H. B. DEMPSEY. 

